Scaffold-bracket.



No. 881,375. PATENTED SEPT.18, 190s. P.L.POLAK.

' SCAFFOLD BRACKET. ,APPLIOATION FILED MAY 10,1906.

us mmms PETERS 420., wasumaruu, 04 c FRANK L. POLAK, OF GLENCOE,MINNESOTA.

' SGAFFOLD-BRACKET.

Specification of; Letters Patent.

Patented Sept. 18 1906.

Application filed May 10,1906- Serial No. 1

To all whom it may concern: 1 I

Be it known that I, FRANK L. POLAK, of Glencoe, McLeod county,Minnesota, have invented certain new and useful Improvements inScaffold-Brackets, of which the following is a specification.

My invention relates to a scaffold-supporting means; and the object ofthe'invention is to provide a support capable of attachment to a ladderor scantling and adapted to be adjusted thereon to permit the convenientup-and-down movement of the scaffold or staging;

A further object is to provide a bracket or support of simple but stronganddurable construction and one which can be easily attached to a ladderor scantling and as readily removed.

The invention consist generally in the various constructions andcombinations, all as hereinafter described, and particularly pointed outin the claims.

In the accompanying drawings, forming part of this specification, Figure1 is a front elevation of a staging or scafioldwith my invention appliedthereto. Fig. 2 is a side elevation of the same, showing thesupporting-ladder resting a ainst the building. Fig. 3 is a detail viewillustrating the manner of mounting the bracket on the ladder. Fig. 4 isa sectional view on a line m x of Fig. 3.

In the drawings, 2 represents an ordinary ladder, and 3 the staging orscaffolding plank, whereon the workmen stand while employed on thebuilding.

4 is a semicircular band, preferably of angle iron, having its endsconnected by a similar bar 5.

6 is a threaded bolt having a locking handwheel 7 at one end and a jaw 8at its opposite end. A movable jaw 9 is slidable on the bolt 6, andadjustment ofthe locking hand-wheel will serve to clamp the ladder-railbetween the fixed jaw 8 and the movable jaw 9. A cam 10 is pivoted onthe bolt 6 near the fixed jaw and adapted to engage the edge of the railand form a positively-acting convenient.

means for clamping the jaws on the ladderrail and locking them againstmovement thereon; the proper degree of force with which the aws clampthe rail being pre viously determined by the adjustment of the lockinhand-wheel;

A clip 11 is centrally secured to the bar 5 and pivoted at 12 on themovable jaw 9.

This-clip has a-loop 13,- to which the sling or tackle device forraising and lowering the staging is attached, the tackle-block beingsecured to the upper end of the ladder, as indicated in Fig. 1. Upon-thebar 5 the staging-planks 3- are placed and held by a suitable stop 15and by a hinged clip 16, having a thumb-screw 17.- The planks will belocated on-both sides of the ladder inconven-' ient position for thepainter orcarpenter to have access to the wall or cornice of thebuilding.v When working near the ground, the portion of the stagingbetween the ladder and the building will ordinarily be used; but as thestaging is raised and is moved nearer the building-wall the workmen insome instanceswill find it more convenient to use the outer plank asasupport. For the purpose of tilting the staging-bracket on its pivot atan angle to the verticalpla'ne of the building I provide a secondthreaded bolt, corresponding to the one described and having a fixed jawto engage the ladder-rail and a locking hand-wheel and also providedwith a movable jaw 18, on which a guide 19 for one flange of the band 4is mounted. A series of holes 20 are provided in the band, and a pin 21fits a hole in the guide and is adapted to slip through one of the holesin the band for the purpose of locking the swinging or tiltingscaffold-bracket at any desired angle with respect to the work. Wheneverdesired, the locking hand wheels may be loosened and the cam leveroperated to allow vertical adjustment of the bracket on the ladder toraise or lower the scaffold.

Generally, as shown, two ladders will be provided, with one bracket oneach ladder, the jaws of the clamping devices gripping the edges of theladder-rails, but having a sufiicient space between them, as indicated.in Fig. 2, to allow the bracket to be moved vertically and clear theladder-rungs. In place of ladders ordinary scantlings may be employed asa support for the brackets.

I do not wish in this application to be confined to any particular sizeof the scaffoldbracket or to the particular means employed for clampingon the ladder-rail, as the same will be found capable of variousmodifica tions.

My invention consists, essentially, in the vertical adjustable bracketand a means for tilting it at different angles with respect to thevertical plane of the building.

I claim as my invention- 1. The combination, with a ladder-rail, of ascafiold-bracket segmental in form and arranged in a plane substantiallyat right angles to the plane of the ladder, said bracket having a barcorresponding to the chord of the segment and forming a rest for thescaffold-planks, means pivotally securing said ing a pivotal connectionwith one of said clamping-j aws and an adjustable connection with theother jaws for'the purpose specified.

3. The combination, with a supportingrail of clamping devices verticallyadjustable thereon, a tackle or sling connecting said clamping deviceswith a fixed support above, and a segmental bracket arrangedsubstantially at right angles to the vertical plane of said rail havinga central connection with said clamping device and adjustable verticallytherewith and forming a support on both sides of said rail for thestaging-plank, substantially as described.

4. The combination, with a supportingrail, of a staging or scafioldingbracket arranged substantially at right angles to the vertical plane ofthe rail and supporting the staging-plank on both sides thereof,clamping-jaws provided on said rail and adjustable vertically thereon, acam-lever for locking or releasing said jaws, means connecting said jawswith said bracket and a tackle or sling connecting said jaws with ahigher fixed support, substantially as described.

5; The combination, with a supporting-rail, of clam ing-jaws arranged inpairs thereon, a scafio d-bracket segmental in form having a barcorresponding to the chord of the segment pivoted centrally to the upperof said clamping-jaws and arranged in a plane substantially at rightangles to the plane of said rail and supporting the staging-plank, andsaid lower jaws having a guide wherein the arc of said segmental bracketis slidable, and means for locking said are in said guide.

In witness whereof I have hereunto set my hand this 7th day of May,1906. v

FRANK L. POLAK. Witnesses:

C. M. TIFFT, FRED ZIMMERMANN.

